May 2014 Biology HL TZ2 paper 3

[skandalism]

I

I did D and E, they're were both so easy, felt great! Both the 6 point questions were quite nice as well!

The ones who did E, what did you answer about how the ant found home? I talked about pheromones..

I mentioned pheromones as well and some kind of sensors.

What did you say about the other ants knowing where to find food ? communication ?

I wasn't sure about that one but I compared how he could do like the honeybees and show with doing some kind of body movement and also leaving some sort of scent along the way. Just 1 point so I'm fine if that one would be wrong but it feels like one is allowed to be kind of vague-ish on those questions!

[han24]

to people doing option G, what did you write for what other reasons could have caused a decrease of the birds' population?

[itemic]

to people doing option G, what did you write for what other reasons could have caused a decrease of the birds' population?

I wrote that there could be increased predation from other species or that there was a lack of food supply

[Ibatemylife2014]

to people doing option G, what did you write for what other reasons could have caused a decrease of the birds' population?

I wrote about how there could have been emigration or lack of food/water supply

[Belle]

to people doing option G, what did you write for what other reasons could have caused a decrease of the birds' population?

I wrote habitat degradation and lack in food supply haahha

[kayaytea]

I thought it wasn't bad but I do NOT like data response and I'm usually bad at it:/

I did option G and H and the 6 mark question on option G was a rainforest conservation one and I was sooooo happy about that!

BUT i wasn't too happy about the Bohr shift:/ I would have preferred something about the liver-_-

Anyone taking option H, what did you write for the Bohr shift?

Option G&H for me as well. For the Bohr shift question, I drew a diagram of it and explained that it occurs when pH decreases due to increased CO2 uptake and that sort of stuff. Although it might be irrelevant, I also wrote about why the oxygen dissociation curve for haemoglobin is sigmoid-shaped.

[Clau.LP]

to people doing option G, what did you write for what other reasons could have caused a decrease of the birds' population?

im not sure if its right but i said food supply/availability and then temperature rising because it may not be appropriate for hatching and that there is higher chances for parasites to survive...

[Alukei]

It was by far the easiest of all papers!

I know I messed paper 1 up, paper 2 was okay and paper 3 was awesome

I had option D & E btw.

Gosh, I messed the "direction of light" (I think it was in E) up and didn't label the neuron correctly. This is really bothering me.

Plus, I didn't really know everything in the polyploid question in option D, I just wrote about allopatric and sympatric speciation and then about how an individual of a species who's diploid can't interbreed with a member of the species who's triploid, but I didn't mention Allopoliploidy or Autopoliploidy, cause I forgot it. x.x

I really wonder what they really wanted to hear for that question ?..

[Belle]

It was by far the easiest of all papers!

I know I messed paper 1 up, paper 2 was okay and paper 3 was awesome

I had option D & E btw.

Gosh, I messed the "direction of light" (I think it was in E) up and didn't label the neuron correctly. This is really bothering me.

Plus, I didn't really know everything in the polyploid question in option D, I just wrote about allopatric and sympatric speciation and then about how an individual of a species who's diploid can't interbreed with a member of the species who's triploid, but I didn't mention Allopoliploidy or Autopoliploidy, cause I forgot it. x.x

I really wonder what they really wanted to hear for that question ?..

Hey, did option D as well. I think it want to say about how tetraploid is formed and can't breed with diploid as the offspring will be triploid which can't do proper meiosis